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PULLEY BLOCK No 249,443; Patented Nov. 8,1881.

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N, PETERS. PhoQaLilhognphar, Waihiuglon. D.C.

UNITED STATES PATENT OFFICE.

THOMAS income, on SOUTH STOOKTON-ON-TEES, AND CHARLES A. HEAD,

or STOOKTON-ON-TEES, ASSIGNORS T HEAD, w IeRrsoN & 00;, on THE TEESDALEIRON WORKS, STOOKTON-ON-TEES, COUNTY or YORK,

ENGLAND.

'I5ULLEY-BLOCK.

SPECIFICATION forming part of Letters Patent No. 249,443, dated November8 1881.

Application filed February 10,1881. (No model.) Patented in EnglandSeptember 28, 1870.

To all whom it may concern Be it known that we, THOMAS MOORE, of SouthStockton-on-Tees, in the county of York, England, engineer, and CHARLESARTHUR HEAD, of the Teesdale Iron Works, Stocktonon-Tees, England,engineer, have invented new and useful Improvements in Pulley'Blocks forRaising and Lowering Sacks and other Weights, which improvements arefully set forth in the following specification, reference being had tothe accompanying drawings.

This invention has for its object improvements in pulley-blocks forraising and lowering sacks and other weights. For this purpose weconstruct a pulley-block with a small chainwheel, over which is passed achain, to either end of which the sack or weight to be raised or loweredis attached. The small chain-wheel has cast concentric with it at one ofits sides an internal toothed wheel, into which gears a pinion, cast atthe side of and concentric with a driving -wheel, over the periphery ofwhich an endless driving chain or cord is passed.

The drivingwheel is of considerably larger diameter than thechain-wheel, and when the driving-wheel is turned, by pulling round theendless driving chain or cord a revolving motion is imparted at areduced speed to the chain wheel and to' the lifting chain which passesover it. The pins or axes upon which the chain-wheel and thedriving-wheel revolve are formed in one piece, they being connected onewith the other by a central crank piece. The outer ends of the pins oraxes are passed through the side bars of the pulley-frame, and aresecured by nuts. The pulley-frame, as is usual, is provided with a hook,by which it can be suspended where desired.

In order that our said invention may be most fully understood andreadily carried into effect, we will proceed to describe the drawings,hereunto annexed.

In the drawings, Figure 1 is a side view of a pulley-block constructedaccording to our invention. Fig. 2 is a cross-section of the same; andFig. 3 is a section taken at the line A B, Fig. 2.

a a is the frame of the pulley-block. It is provided with a hook, or, bywhich it may be suspended from any suitable support. Zr 1) is a crankedaxis or pin fixed in this frame. 0 is the chain-wheel, over which thelifting and lowering chain (1 is passed. fixed axis or pin 11. cast inone piece with thechain-wheel c. f is a pinion gearing with the ring ofinternal teeth 6. The pinion f also turns freely on the axis or pin b,and the driving-wheel g is formed'in one piece with it. An endless band,cord, or chain for actuating the apparatusis passed over this wheel.

We are aware that pulley-blocks have heretofore been constructed inwhich two wheels or pulleys are employed, one working loose upon aneccentric and the other keyed to a straight revolving shaft passingthrough and fixed to said eccentric, anioscillatin g plate and a coggedwheel gearing with internal teeth formed upon onepulley being arran gedbetween said pulleys; but this is essentially different from ours bothin construction and operation, as it operates upon the principle ofgaining one tooth or notch for each revolution of the drivingwhe'el, andas it is designed for lifting heavy weights the movement of thechain-wheel is very slow, as each revolution requires as many completeIt turns freely on the e is a ring of internal teeth turns of thedriving-wheel as there are teeth on the eccentrically-operated pinion orinside wheel, while our device, which is designed for lighter weightsand faster movements, has no eccentrics or eccentric movements, as itsoperation is not essentially difierent :from what it would be if theteeth 6' were on the outside and the pinion f exterior. By making it inates as an interior support for each of the two pinion f, andlifting-wheel 0, having the inteaxes,- which has not heretofore beenacoomnor gear or cogs e, constructed and operating plished when the axeswere not in line. substantially as shown and described.

Havin thus described the nature of our in- 5 vention and the manner ofperforming the HEAD same, we would have it understood that we claim asour improvements in pulley-blocks for Witnesses:

raising and lowering sacks and other weights WALTER H. MILLS,

The fixed bent shalt b b and frame a, in com- HENRY ROBINSON, robination with the driving-wheel g, having the Solic'itors Ole r708.

